Pawl-controlling mechanism



Feb, 10. 1925. 1,526,125

w.' c. FELLOWS ET-AL PAWL CONTROLLING MECHANISM Filed ec'. 15, 1922 7 Sheets-Sheet 2 Feb, 10'. "1925. W. .C. FELLOWS ET AL PAWL CONTROLLING MBCHANISII Filed Dec. 15. 1922 'fSheets-Sheet 3 w. 'c. FELLOWS ET A].

FAWL CONTROLLING MECHANISM Feb..;1.0. 1925.

Filed Dec. 15, 1922 1,526,125 W. C. FELLOWS ET Al- PAWL CONTROLLING MECHANISM Wm L Wm Q r r m l NM a A \m, w mm FehlOJQZS.

w. c. FELLOWS ET AL PAWL CONTROLLING MECHANISM 7 Sheets-Sheet Filed Dec. 15, 1922 bw mN Patented l0 H2425 Ul ll l hw STfialES PATENT ll 4 ke do WALTEE C. FELLOWS;.AND ROBERT A. MILLAR, PHILADELPHIA, PENNSYLVANIA, ASSIGNO R-S TO MATILBA J. DELL, OF PHILADELPHIA, IPENNSYLVANIA.

IPAYVL-CGNTBOLLING MECHANISIH.

Application filed December 15, 1922.

To all 20710972 it may concern.

Be it known that we, lVALTER C. Fin,- LOWS and Bonsai A. Multan, citizens of the United States, residing in Philadelphia, Pennsylvaniiu have invented a Pawl-Controlling lllechanism, of which the following is a specification.

(lne object of this invention is to pro vide a simple, substantial and practical combination of parts for controlling or actuating a constantly oscillating element such as the feed pawl of a machine tool and more particularly of a slotter such as that described and claimed in a patent to T. C. Dill-#1776501, dated December 6, 190st.

We further desire to provide a conveniently operative attachment for. permitting actuation of a feed pawl or dog from any of a number of positions around a machine tool to which said attachment is applied.

ing moved from a neutral position into either of its feeding positions or vice versaunder operating conditions.

These objects and other advantageous ends we attain as hereinafter set forth, ref- .ce being had to the accompanying drawings, in which,

Figs. 1 and 2 are respectively a side elevation and a plan showing the invention as appliedto a slotter;

Fig; 3 is an end elevation of the attach ment shown in Figs. 1 and 2;

Fig. 4 and Fig. 5 are respectively-a front and an end elevation of the pawl actuating levers with their associated parts connecting them to the shift rod;

Fig. 6 is a fragmentary elevation, partly in section, showing the feed pawl and certain of its associated parts; f

Fi 7 is a; frontclevationof} the lower Serial No. 607,162.

end of the oscillating arm with the parts carried thereby;

Fig. 8 is an end elevation showing the lower end of the oscillating arm in vertical. section and illustrating the relative positions of the feed pawl and of the controL ling device associated therewith;

F 9 is a plan partly in. horizontal section, showing the pawl and the operating levers;

Fig. 10 is an elevation, partly in vertical section, illustratingthe connection between the rotary table and the shift rod;

Figs. 11 and 12 are respectively a plan and an elevation of the structure shown in Fig. 10;

Figs. 13 and 14.- are respectively av side and a front elevation illustrating the connectionbetween two parts of the shift rod mechanism Figs. 15 and 16 are respectively an elevation and a plan illustrating the detail construction of the connection between horizontal and verticalportions of the shift rod; and

Figs. 17 and 18 are respectively a front and an end elevation of a modified form of the pawl operating lever mechanism.

Referring to Figs. 1 to 3 inclusive of the above drawings, 1 represents a stud or shaft on which is mounted a ratchet wheel 52 connected by mechanism, not shown but \vel known in the art, to the table 3 which is longitudinally slidableon the bed 4 of a machine tool such as a slotter. On this table 3 is slidably guided a transversely movable table 5 which in turn supports a work-carrying table 6 in such manner that the latter is rotatable on a vertical For longitudinally feeding the main table e) the ratchet wheel 2' is intermittently turnedin one direction or the other by a double pawl 7- pivotally mounted on an arm 8' of a bell crank lever, which is fulcrumed on the stud 1 and whose second arm 9 is connected through a link 10 to a crank 11. Oscillation of the latter will oscillate the lever 89 and after the pawl 7 is engaged with the wheel 2., will intermittently turn this in the well understood manner.

In accordance with our invention we provide means whereby an operator on either side or at either end of the machine may convenientlyQperatethe pawl 7 While the machine is in operation so as to cause the ratchet wheel 2 to be turned in either direc tion, or by moving the pawl to a neutral position, disconnect the feeding mechanism from the source of power. For this purpose we provide bearings 1212 projecting from the sides of the bed 4 of the machine in positions to support longitudinally movable shift 1 ars 13 and 14 horizontally along the opposite sides of said machine. These bars are operatively connected by a transverse shaft 15 rotatably mounted in bearings 16 at one end of the machine and having arms 17 and 18 fixed to its ends. The latter, as shown in Fig. 1, are forked to engage pins such as that indicated at 19 mounted in the rods 13 and 14, so that longitudinal movement of either rod will cause turning of the shaft 15 and similar longitudinal movement of the second rod.

F or returning this system of shift rods to and maintaining it in a neutral position, I fix upon one of the rods as 13, a pair of col lars 20 and 21 positioned on opposite sides of and at substantially equal distances from one of the supporting bearings 12. Between each of these collars and said bearing 1 mount on the rod a coil spring 22, so that while the rod may be moved longitudinally, such movement from its normal position is opposed in either direction by one of said springs.

In order that the shift rod may be automatically moved by the rotary table 6 when this is desirable, we form the latter with a peripheral undercut groove (Fig. 10) as indicated at 23 and in this slidably mount a dove tailed clamping block 26 and a dog 24, to the latter of which is hinged an extension lVhile said dog may be moved to any desired position around the periphery of the table 6, we may retain it at any point desired by the clamping block 26. This latter has mounted in it a set screw 27 which also passes through the dog 24 and when screwed up will cause said block to grip the walls of the groove and the dog 24 to grip the periphery of the table 6, thus preventing movement of the said dog 24.

For transmitting movement from the rotary table 6 to the shift rod 13 I mount on the table 3 two bearings 2828 designed to slidably guide a horizontal, transversely ex tending shift rod 29 projecting across the bed 4 and beyond the sides of the same. As shown in Figs. 10 and 12, this rod 29 has mounted upon it a pair of collars 3030 between which extends the forked end of a lever 31 fulcrumed on a suitable pivot member 32 carried by a flange 33 projecting from the table 5, said lever being extended upwardly in such position as to cooperate with the latch portion 25 of the dog 24. hen engaged by the latter the rod 29 is longitudinally shifted in its bearings 28.

For transmitting movement from the rod 29 to the rod 12 we mount a vertical shaft 34 in one of the bearing structures 28 which is suitably formed for this purpose, and on the upper end of said shaft fix a forked arm whose branches extend between the flanges of a collar 36 clamped to the rod 29, as shown in Figs. 13 and 14. On the lower end of the shaft 34 is fixed a forked arm 37 in such position that its branches engage, the flanges of the collar 38 clamped to the rod 13. Either or both of the collars 36 and 38 may be unclamped from their respective shafts in case it is desired to longitudinally adjust the table 3 on the bed or the carriage 6 on the table 3, it being understood that the shaft 34 and rod 29 are ordinarily only used when the shift rod 13 is to be actuated from the rotary table 6.

For transmitting movement from the shift rod 13 to the pawl 7 while it with the arm 8 is being oscillated, in order to move it to a neutral position or turn it so far as to re verse the direction of movement of the ratchet wheel 2, we may utilize the mechanism shown in detail in Figs. 4 to 9 inclusive. In these figures the pawl 7 is shown as fixed to a short spindle 4O journaled in and projecting laterally through a suitable bearing in the outer portion of the arm 8. This spindle also has fixed to it a head 41 shown in the present instance as pentagonal in out line and acted on by two oppositely placed spring-actuated plungers 42 and 43, slidably guided in the outer face of the swinging arm 8.

These plungers bear such a relation to the head 41 of the spindle that when the pawl is in either of its two extreme positions eir gaging the teeth of the ratchet wheel 2, the head of the plunger 42 yieldingly engages one of the flat sides of said spindle head 41. lVhen so engaged with either of these sides, the head of the plunger 43 engages one of the corners of the spindle head 41 but when the pawl in a neutral position disengaged from the ratchet wheel 2, said plunger eugages the adjacent flat side of the spindle head. As a result the pawl tends to remain in either of its extreme positions or in its neutral position after it has been brought thereto.

The pawl 7 adjacent its ends has projccting laterally from it two pins 44 and 45 whereby it may be turned into or out of engagement with the ratchet wheel 2. For transmitting movement from the shift rod 13 to these pins we mount on the bed of the machine a suitable supporting plate or frame 46 and on this mount a swinging plate 47 pivotally carried on a stud 48 preferably projecting from the top of the plate 46. This swinging plate 47 through a link 49 is connected to an arm 50 of a bell crank lever fulcrumed on a pin or stud 51 at one Lit) sideof the supporting plate 46 and having a second arm 52 extending upwardly between the branches of an inverted U-shaped fork 53 projectingfrom an arm 54 pinned on the end of therod 13. The arm 52 pref erably has mounted in it a rod 55 fixed in position and projecting from its opposite sides with its rounded extremities respec' ti'vely. engaging the opposite branches of the member 53. g j

l a consequence of this construction,

longitudinal movement of the shift rod 13 lever pivoted to the lower portion of the supporting plate 46 by means of a pin or stud 61- A. second arm 62 of this lever projects in a. substantially horizontal line and is so positioned as to be movable into the pathof the pawl-carried pin'45. A second bell crank lever pivoted on astud 63 has an arm- 64 positioned to coa-ct with the roller 59 and includes a second arm 65 projectingin a generally horizontal position so as to be capable of movement into engagement with the pawl-carried pin 44.

From Fig. 4 it will he noted that the two lever arms 62 and 65 overlap or lie immediately adjacent each. other across the bottom of the plate 46 and their arms 64 and their roller-engaging sides or edges are so formed that under the action of the rollers onthe swinging plate 47, either of them may be so moved as to cause its horizontal arm to engage one of the pins 44 or 45 on the pawl to move it'to a neutral position. The two arms and 64 are normally held toward and in engagement with their respective rollers58and 59 by theaction of gravity on their arms 62 and respectively and these latter are limited as to their downward movement by apin 66 projecting under them from the lower portion of the supporting plate 46. i As will be understood by those skilled in the art, when the machine tool is in operation, the arm 8 is continuously oscillated, and if one end of the pawl 7 is in engagement with the ratchet wheel 2, the latter is moved through a predetermined angle each time said arm swings'in one direction. When it swings in the opposite direction the pawl frees itself from said ratchet wheel. If now an operator wishes to throw the pawl to its neutral position to stop action of the feed wheel, he longitudinally moves the shift rod 13 either by hand or by moving-the rod 14 on the other side of the machine. If it be assumed that the pawl is in the position shown in Fig. 6, the shift rod 13 must be moved toward the right, with the result that the link 49 is pulled downwardly and the plate 47 is swung in a counterclockwise direction. Its roller 59 thereupon acts upon the lever arm 64, causing the lever arm 65 to swing upwardly into engagement with the pawlcarried pin 44 so that the pawl is turned to -a neutral position in which it is held by reason of the engagement of the plunger 4;) with the flat face of the spindle head 41.

lVhen it is desired to again throw the" pawl into action to continue the movement of the ratchet wheel 2 in the same direc-- tion as that in which it was originally moved, the shift rod 13' is moved toward the ratchet, thus swinging. the plate 47 in a clockwise direction and through the lever arms 60 and'62 swinging the pawl 7 through its pin 45 into position to again engage the said ratchet w ieel. If when the pawl is in the neutral position, the shift rod13 be. sufficiently moved toward the right, the lever arm 65 is swung upwardly and" through the pin 44 is caused to move the" pawl so that its opposite endengages the ratchet wheehthereby reversingits direction of movement.

Obviously if the rotary table 6 be con nected tobe rotated by the use of the cuetomary feed gearing associated with the ratchet wheel 2,-the dog 24 may be set in such position that after said table has turned through apredetermined angle, the portion 25 will engage the member 81. When this occurs the swinging of said lever on its fulcrum will longitudinally move the rod 29, will turn the vertical shaft 34 and so move the rod 13 as to throw the pawl 7 to its neutral position, stopping further feed of the table.

As an alternative to the device shown in Figs. 4, 5, 8 and 9, we may employ the mechanism shown in Figs. 17 and 18 for transmitting movement from the shift rod 13 to the pawl-carried pins 44 and 45. This mechanism includes" a supporting plate 46 having a swinging segment 47 pivoted to it and connected through an arm 70 and a link 49 with the arm 50 of rod-actuated bell crank having the same construction as shown in Fig. 17. The segment 47 however has a circularly curved edge portion 71 at the ends of which are gear teeth 72 and 73. A second swinging seg ment 74 is pivoted on a stud 75 at the bottom of the sup-porting plate 46 and has a portion of its edge formed concave and concentric with the pivot 76 of the segment 47* so as to closely fit against the curved edge 71 of the latter.

Adjacent the ends of this concave portion of the edge of said segment it likewise is formed with gear teeth 77 and 78, and the arrangement is such that after the segment 47 has been swung for a predetermined distance in either direction from a central position, one or the other of its sets of teeth 72 or 73 will engage and coact with one or the other set of teeth 77 or 78 of the segment 74, thereby causing turning of said segment on its stud. Adjacent the segment 74 and on opposite sides thereof are a pair of supporting studs or pivots 79 and 80 respectively serving as fulcrums for a pair of levers 81 and 82 whose long arms are respectively positioned to be movable into the paths of the pawl-carried pins 44 and 45.

For actuating these levers the first of them has connected to its short arm one end of a flexible band 83 passing around a roller or pulley 84 on the segment 74 and having its other end connected to a pin 85. The lever 82 likewise has its short arm connected to one end of a flexible band 86 passing around a second pulley and having its second arm connected to a post 87 in the adjacent side of the segment 74. As in the other form of my invention, the longitudinal movement of the shift rod 13 in either direction from a neutral position will cause the pawl to be moved through one of its pins 44 or from an extreme position into the neutral position or from a neutral position to one of its extreme positions.

From the above description it will be appreciated that it is possible for an operator to transmit movement to and perfectly control the operation of the pawl on the swinging feed arm, even though this be oscillating, and it is noted that such control may be exercised by the operator from any of a number of positions around the machine. Moreover by means of the automatic attachment, a moving part of the machine such as the table, may be caused to operate the pawl at a predetermined time after it has moved through a predetermined path.

Vi e claim: 1. The combination of a ratchet wheel; a pivotally mounted, bodily oscillated pawl for actuating said wheel; two independent levers positioned to operate said pawl; and means for actuating either of said levers at will, consisting of a shift rod connected to operate one of the levers when it is moved in one direction and to operate the other lever when it is moved in the opposite direction.

2. The combination of a ratchet wheel; a pivotally mounted, bodily oscillated pawl for actuating said wheel; laterally projecting pins on the pawl; two levers mounted to cooperate with said pins respectively to swing the pawl on its pivot; and means for actuating either of said levers at will.

3. The combination of a ratchet wheel; a pivotally mounted, bodily oscillated pawl for actuating said wheel; laterally projecting pins on the pawl; two lovers having arms operative in parallel planes and mounted to cooperate with said pins respectively to swing the pawl on its pivot; and means for actuating either of said levers at will.

4. The combination of a machine tool including a movable table and a ratchet feed wheel; a pivotally mounted, bodily oscillated pawl for actuating said ratchet wheel; a dog adjustably mounted on the table; and means controlled by the dog for operating the pawl when the table moves to a predetermined position.

5. The combination of a machine tool including a work table and a ratchet feed wheel; a bodily oscillated pawl for actuating said wheel; a dog on the table; a shift rod connected to be actuated by said dog when the table moves to a predetermined position; and means for transmitting movement from said shift rod to the pawl while it is oscillating.

6. The combination of a machine tool; a ratchet feed wheel therefor; a pawl for actuating said wheel; a shift rod including two sections mounted adjacent opposite sides of said machine; means for operatively connecting the sections of the shift rod; and means for transmitting movement from the shift rod to the pawl.

WALTER C. FELLOWS. ROBERT A. MILLAR. 

